Virtual Router Redundancy Protocol Commands
40-5
40
Command Mode
Interface (VLAN)
Command Usage
• VRRP advertisements from the current master virtual router include
information about its priority and current state as the master.
• VRRP advertisements are sent to the multicast address 224.0.0.18. Using a
multicast address reduces the amount of traffic that has to processed by
network devices that are not part of the designated VRRP group.
• If the master router stops sending advertisements, backup routers will bid to
become the master router based on priority. The dead interval before
attempting to take over as the master is three times the hello interval plus half
a second
Example
vrrp preempt
This command configures the router to take over as the master virtual router for a
VRRP group if it has a higher priority than the current acting master router. Use the
no
form to disable preemption.
Syntax
vrrp
group
preempt
[
delay
seconds
]
no
vrrp
group
preempt
•
group
- Identifies the VRRP group. (Range: 1-255)
•
seconds
- The time to wait before issuing a claim to become the master.
(Range: 0-120 seconds)
Default Setting
Preempt: Enabled
Delay: 0 seconds
Command Mode
Interface (VLAN)
Command Usage
• If preempt is enabled, and this backup router has a priority higher than the
current acting master, it will take over as the new master. However, note that
if the original master (i.e., the owner of the VRRP IP address) comes back on
line, it will always resume control as the master.
• The delay can give additional time to receive an advertisement message from
the current master before taking control. If the router attempting to become the
Console(config-if)#vrrp 1 timers advertise 5
Console(config-if)#
Summary of Contents for 8926EM
Page 6: ...ii ...
Page 34: ...Getting Started ...
Page 44: ...Introduction 1 10 1 ...
Page 62: ...Initial Configuration 2 18 2 ...
Page 64: ...Switch Management ...
Page 76: ...Configuring the Switch 3 12 3 ...
Page 118: ...Basic Management Tasks 4 42 4 ...
Page 164: ...User Authentication 6 28 6 ...
Page 176: ...Access Control Lists 7 12 7 ...
Page 284: ...Quality of Service 14 8 14 ...
Page 294: ...Multicast Filtering 15 10 15 ...
Page 300: ...Domain Name Service 16 6 16 ...
Page 310: ...Dynamic Host Configuration Protocol 17 10 17 ...
Page 320: ...Configuring Router Redundancy 18 10 18 ...
Page 344: ...IP Routing 19 24 19 ...
Page 356: ...Unicast Routing 20 12 20 Web Click Routing Protocol RIP Statistics Figure 20 5 RIP Statistics ...
Page 386: ...Unicast Routing 20 42 20 ...
Page 388: ...Command Line Interface ...
Page 400: ...Overview of the Command Line Interface 21 12 21 ...
Page 466: ...SNMP Commands 24 16 24 ...
Page 520: ...Access Control List Commands 26 18 26 ...
Page 546: ...Rate Limit Commands 30 2 30 ...
Page 612: ...VLAN Commands 34 24 34 ...
Page 626: ...Class of Service Commands 35 14 35 ...
Page 670: ...DHCP Commands 39 16 39 ...
Page 716: ...IP Interface Commands 41 36 41 ...
Page 768: ...IP Routing Commands 42 52 42 ...
Page 770: ...Appendices ...
Page 791: ......